WO1996001384A1 - Indicateur de position de vanne rotative et procede de mise en ×uvre - Google Patents

Indicateur de position de vanne rotative et procede de mise en ×uvre

Info

Publication number
WO1996001384A1
WO1996001384A1 PCT/US1995/004107 US9504107W WO9601384A1 WO 1996001384 A1 WO1996001384 A1 WO 1996001384A1 US 9504107 W US9504107 W US 9504107W WO 9601384 A1 WO9601384 A1 WO 9601384A1
Authority
WO
WIPO (PCT)
Prior art keywords
switch
housing
actuator
switch housing
magnet
Prior art date
Application number
PCT/US1995/004107
Other languages
English (en)
Inventor
Daniel Walker
Original Assignee
Keystone International Holdings Corp.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=23031594&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1996001384(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Keystone International Holdings Corp. filed Critical Keystone International Holdings Corp.
Priority to EP95915011A priority Critical patent/EP0766801A1/fr
Priority to AU22055/95A priority patent/AU2205595A/en
Publication of WO1996001384A1 publication Critical patent/WO1996001384A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0025—Electrical or magnetic means
    • F16K37/0033—Electrical or magnetic means using a permanent magnet, e.g. in combination with a reed relays
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0025—Electrical or magnetic means
    • F16K37/0041—Electrical or magnetic means for measuring valve parameters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/0318—Processes
    • Y10T137/0402—Cleaning, repairing, or assembling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8158—With indicator, register, recorder, alarm or inspection means
    • Y10T137/8225—Position or extent of motion indicator
    • Y10T137/8242—Electrical
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8158—With indicator, register, recorder, alarm or inspection means
    • Y10T137/8225—Position or extent of motion indicator
    • Y10T137/8275—Indicator element rigidly carried by the movable element whose position is indicated

Definitions

  • This invention relates generally to an electrical apparatus for remote monitoring of a rotary valve position. More specifically, this invention relates to an improved construction of a rotary valve position indicator.
  • An electrical valve position indicator may be used with each monitored valve to provide a signal to the system control computer.
  • the signal provided by a valve position indicator is indicative of a status condition of the particular valve, such as whether the valve is fully open, fully closed, partially open, and so forth.
  • the electrical switches used in these bulky indicators often have "bounce" problems that may produce false signals in a control system.
  • the switch contacts in such devices are often affected by moisture or other factors so that even if the contacts close properly, they may still have too much contact resistance to allow proper electrical signal flow. This may be especially true for relatively low amperage signals associated with solid state automation control systems. Such problems may cause system operation errors by producing false or intermittently faulty signals. Even sealed contacts may eventually develop contact resistance problems. Due to the weather-proof or explosion-proof housings of electrical contact boxes, it is difficult and time-consuming for an operator to check whether a fault condition is the result of the contacts being closed but not conducting, or whether the contacts failed to close altogether, or whether the electrical problem lies somewhere in the cabling or interconnections. Once the housing is removed, the contact box is no longer explosion-proof and activation of a switch during checking or maintenance could ignite flammable or explosive vapors.
  • switch indicator devices The mounting of the switch indicator devices to the valve actuator assemblies is often cumbersome and difficult because it requires threading and tightening of numerous small screws or nuts.
  • the metallic construction of many switches eventually results in corrosion that causes the switch installation to physically seize up, weaken or come loose, leak, or otherwise operate in an undesirable manner.
  • Heavy valve switch boxes are expensive and require considerable ongoing maintenance. Because the switch indicators are large, bulky, and clumsy, they are difficult to manufacture and have tended in the past to spawn many different non- standardized brands that may have to be used in a single system. Switch packages are typically cumbersome in that two separate packages must be used to provide an open position switch and a closed position switch.
  • valve position indicators especially those that use inductive or capacitive proximity detectors, requires precise voltage specifications and cannot be used without modification for both alternating and direct current power. Power fluctuations may cause false signals to be produced in such valve position indicators to thereby deleteriously affect the computer control system. As well, valve position indicators are typically sensitive to load variations.
  • valve position indicator designed for use with an inductive load may cause system problems when used with a solid state load.
  • a solid state valve position indicator that is required to even momentarily switch a load outside its tolerances will often fail.
  • an object of the present invention is to provide an improved rotary valve position indicator. Another object of the present invention is to provide for local visualization of contact operation.
  • Yet another object is to provide a switch package that will not create any sparking or arcing, even under maintenance circumstances, in an explosive atmosphere.
  • a feature of the present invention is a rotating magnet holder housing separate from an electronics switch housing.
  • An advantage of the present invention is reduced costs for an improved product.
  • Another advantage of the present invention is reduced user costs because maintenance costs are decreased by using throwaway device logic.
  • Yet another advantage of the present invention is to provide end of travel indicators for both open and closed valve positions in a single switch housing.
  • the present invention provides for an indicator assembly to indicate a valve position of a rotary valve element.
  • the rotary valve element is rotatable by an actuator assembly that is typically disposed in an actuator assembly housing.
  • the actuator assembly includes a rotational element that rotates along with the rotary valve element to open and close the valve.
  • the indicator assembly includes a magnet holder attached to the rotational element of the actuator assembly with a magnet disposed in the magnet holder for rotation along with the rotary valve element.
  • An electronic switch housing is also mounted to the rotary actuator housing adjacent to the magnet holder so that the rotary actuator housing independently supports the electronic switch housing and the magnet holder, respectively, at a selected distance therebetween.
  • the electronic switch housing includes a reed switch therein that is responsive to rotation of the magnet for indicating a position of the rotary valve element.
  • the electronic switch housing may be connected to the actuator housing by a fastener, such as a threaded fastener.
  • the electronic switch housing is open to ambient conditions associated with the valve.
  • Light- emitting diodes are preferably electrically connected to the outputs of the reed switches so as to provide a readily obtained local verification that the switch is not only closed, but that it is also conducting.
  • At least two magnets are preferably provided in the magnet holder.
  • the magnet holder is connected to the rotational element of the rotary actuator.
  • the electronic switch housing may be sealed with epoxy or other electrically nonconductive sealing material.
  • Each magnet independently operates a respective reed switch.
  • the electronic switch housing is mounted to the actuator housing independently of the magnet holder. As the actuator is activated, the magnets operate the reed switches to indicate the open or closed position of the valve.
  • FIG. 1 is an elevational view, partially in section, of a rotary valve indicator mounted to a valve actuator in accord with the present invention
  • FIG. 2 is an upper view, partially in section, of the rotary valve indicator of FIG. 1 along the line 2-2;
  • FIG. 3 is an elevational view, partially in section, of an alternative embodiment rotary valve indicator
  • FIG. 4 is an elevational view, partially in section, of the switch housing of FIG. 3 along the line 4-4;
  • FIG. 5 is an elevational view, partially in section, of the rotary valve indicator of FIG. 1 along the line 5-5;
  • FIG. 6 is an elevational view, partially in section, of stacked switch housings and magnet holders;
  • FIG. 7 is a schematic for an electronic switch in accord with the present invention.
  • FIG. 8 is an alternative embodiment schematic for an electronic switch in accord with the present invention.
  • the present invention provides generally for an improved rotary valve position indicator and method.
  • the rotary position indicator of the present invention is preferably characterized by its separation of magnet holder housing and electric switch circuitry. This construction produces two housings, rather than one housing with a rotatable portion built into the housing as is seen in prior art rotary position indicators. The result is an indicator assembly with two smaller and more convenient overall size housings, sturdier construction, and uncomplicated operation.
  • Those skilled in the art will immediately appreciate that the present invention is a great improvement over prior art rotary valve position indicators.
  • the preferred separate mounting of a rotary magnet holder housing from the electronics control box effectively eliminates those problems associated with rotating components within a single housing.
  • the relatively simple improvement of placing the magnets and switches in separately mounted housings produces numerous surprising advantages, as discussed hereinafter, that provide solutions to many problems that have plagued prior art valve position indicators.
  • Position indicator assembly 10 mounted to valve actuator housing 12 of actuator 13.
  • Position indicator assembly 10 includes electronic switch 14 and magnet holder 16.
  • Valve actuator housing 12 is mounted to rotary valve 17 (see FIG. 5).
  • Rotary valve 17 includes rotary valve element 19 that rotatably moves between an open and a closed position to control fluid flow through bore 21.
  • Rotary actuator 13 may be electrically, pneumatically, manually, or otherwise powered, for rotary movement of rotary valve element 19.
  • rotary actuator 13 is of the pneumatic type, with pneumatic pistons 22 having racks 25 secured thereto for engaging and rotating pinion 18 to open and close rotary valve 17.
  • Actuator shaft 20 is rotatable and is preferably connected, directly or indirectly, to rotary valve shaft 23 that rotates rotary valve element 19.
  • Magnet holder housing 16 is mounted on actuator shaft 20 of rotary actuator 13 and rotates therewith. Therefore, magnet holder housing 16 also rotates in concert with rotary valve shaft 23 and corresponding rotary valve element 19.
  • Magnet holder housing 16 preferably contains two magnets 26 and 28, each producing a magnetic field, that are used to indicate the open and closed positions of valve 17. Magnets 26 and 28 may be arranged in various configurations, as desired, to activate reed switches 30 and 32, which are correspondingly arranged to most suitably receive the respective magnetic fields of the magnets. While magnets 26 and 28 are preferably mounted within substantially cylindrical magnet holder housing 16, they could also be on arms (not shown), in a disc (not shown) that could rotate above switch housing 15, or in numerous other configurations as desired.
  • the relative position of the magnets 26 and 28 with respect to reed switches 30 and 32, and more particularly switch contact elements 31 and 33, shown with respect to reed switch 30, determine the degree of rotation of valve element 19 at which reed switches 30 and 32 open and close. Because the switches of the present invention are magnetic and have no wear, the particular point of opening and closing during rotation of valve element 19 does not change due to electrical variations or mechanical wear that occurs in other switches. The operating repeatability of opening and closing of the switches, with respect to position of the valve, stays within about plus or minus one-half degree. An adjustment mechanism (not shown) may be used herewith to adjust the particular valve angle at which the opening and closing of the switches occurs.
  • the magnets 26 and 28 are preferably of the rare earth type so as to provide relatively constant magnetic field strength over a long period of time, although other types of suitably long-lasting magnetic material could also be used. With long-lasting magnets, the reed switches are reliably operated in a stable manner over a long period of time, so that there is no significant signal timing variation due, for instance, to aging of the magnet. Magnets 26 and 28 may be encapsulated, if desired, to reduce the possibility of any corrosion that could affect magnet strength.
  • magnet housing 16 has a substantially square or rectangular socket (or plug) mounting 27 (see especially FIG. 2) that secures its position with respect to the preferably square or rectangular end portion 19 of actuator shaft 20.
  • Switch housing 15 may be mounted to actuator housing 12 with brackets 35 and screws 37 at threaded mounting holes 39.
  • switch housing 15 may be mounted on stand-offs 40 with threaded bolts 42 (see FIGS. 3, 4, and 6).
  • Bolts 42 may extend through electronics switch 14 or may be accessible through an aperture through the housing.
  • Blank stand offs 63 do not have a bolt therethrough but are preferably molded onto switch housing 15 for additional support.
  • the mounting stand offs 40 preferably have weep slots 61 therein. Weep slots 61 allow any liquid which may enter at the head of securing bolts 42 to flow out or evaporate rather than become trapped so as to produce mold or bacteria.
  • This latter mounting method may be preferred for valve operation in sterile environments where surfaces are preferably exposed to the ambience so they can be more easily cleaned.
  • a sterile environment in which such a mounting may be desired could, for instance, include a brewery with an automated valve system.
  • Applicant preferably mounts the magnets separately from the reed switches in a separate magnet holder housing 16 and electronics switch 14 because such a configuration results in surprisingly numerous benefits.
  • This separate construction results in less complex, smaller, more compact, sturdier, and more easily mounted components.
  • This simple construction avoids the problem of cracks and crevices that can collect debris, as is undesirable in a sterile environment, because the separate electronics switch box 15 and magnet housing 16 are easily formed with smooth walls, such as smooth walls 34 and 36 on the switch box and magnet housing, respectively. While magnet housing 16 and switch box housing 15 have the shape herein disclosed, they could have other shapes as desired.
  • Mounting wall 47 may for some purposes be preferably raised by stand-offs
  • switch box 15 is box-like and has six sides 47, 49, 51, 53, 55, and 57.
  • the mounting is preferably made using just one side of switch box 15 to prevent the formation of unnecessary cracks and crevices during the mounting.
  • lower side 47 is used in FIG. 3 and an outer side 53 is mounted with brackets 35 in FIG. 2.
  • the remaining sides are connected to actuator housing 12 only by virtue of their connection to switch box 15 and not due to other external connecting members that form additional cracks and crevices.
  • Switch housing 15 and magnet holder 16 are clearly not held together by a larger housing or interconnected structure as used in the prior art, but are separately and independently mounted and supported by actuator 13.
  • the magnet-reed switch spacing between switch housing 15 and magnet holder 16 is normally fixed at the desired optimal spacing by the positioning of threaded mounting holes 39 in outer surface 59 of actuator housing 12 (see FIG. 4). Thus, no adjustments are normally required.
  • the mounting bracket 35, stand-offs 40, or mounting holes 39, or mounting method could be reconstructed or designed for a different magnet-reed switch spacing.
  • switch box 15 is easily sealed if desired, as by filling with epoxies or other nonconducting materials. Therefore, electronic switch box 14 is preferably filled with a sealing material 29, such as epoxy, elastomeric material, or the like (see FIG. 4). Although reed switches 30 and 32 contain movable contact elements 31 and 33, the contact elements are hermetically sealed so that the switches are conveniently epoxied in place if desired.
  • the magnets and switches be securely mounted, within the respective switch housing 15 and magnet holder housing 16, in a manner that will not change due to vibration or even severe shocks such as if switch housing 15 or magnet housing 16 is dropped during, for instance, transport or assembly. Because housings 15 and 16 are preferably filled with epoxy or other such material, secure mounting of the switches and magnets is not a problem in the present invention. This sturdy mounting provides a great advantage over prior art assemblies that normally cannot be dropped or otherwise experience significant g- shock and/or extensive vibration without damage or calibration variations. To further enhance electronics switch 14 sealing, it is possible to include a preferred embodiment connector socket 38 therewith, which may conveniently include five pins 43 (see FIGS.
  • Connector socket 38 may also be of the type that is used with a flange-type plug (not shown), such as a connector assembly available from Brad Harrison or other connector manufacturers, that quickly and securely provides a good electrical connection. Other connections may also be used. For instance a conduit (not shown) may be installed directly to connector 38 without a sealed interior portion 45 but having several feet of leads extending therefrom to be threaded through the conduit.
  • the sealed switch housing 15 remains water tight.
  • switch housing 15, including switches, L.E.D.'s, and circuitry is completely filled with epoxy, the present invention is effectively explosion-proof so as to be useable in areas which become filled with explosive or highly flammable vapors.
  • Open indicator 42 and closed indicator 44 provide a visual indication of whether a respective reed switch 30 or 32 is activated.
  • FIG. 7 which shows a simplified schematic diagram of the circuit of switch 14 within switch housing 15
  • open indicator 42 will light when corresponding reed switch 30 is magnetically activated to make contact by a corresponding magnet.
  • Open and closed indicators 42 and 44 are preferably L.E.D. 's (light emitting diodes).
  • voltage from a power source or signal source V is applied to reed contacts of reed switches 30 and 32.
  • contacts of reed switch 32 will close to connect light 44 to control devices (not shown) and activate light 44.
  • Voltage V is also applied to output line 52 to indicate that valve 17 is closed.
  • Reed switch 30 is open so that light 42 is off and output line 54 is de- energized.
  • both lights and output lines will be disconnected from voltage V, and the computer system will sense the valve is moving.
  • light 42 is on and output line 54 is connected to voltage V.
  • Reed switches 30 and 32 have small contact mass and therefore are not likely to produce contact "bounce" that could disrupt output signals to a system that may be connected to output lines 52 and 54.
  • hermetically sealed reed switches 30 and 32 are less likely than large contacts to develop contact resistance due, for instance, to corrosion.
  • Contact resistance sometimes prevents otherwise closed switches from conducting relatively small analog and control signals that are typically between about 4 to 20 milliamperes. Such signals are typically greater than about 2 milliamperes.
  • a preferred embodiment switch may be designed for about 25VA. Thus, with a 24 volt AC or DC power, it may provide up to about 1 ampere of current. With 120, volts it provide up to about 0.2 amperes of current.
  • the use of reed switches in the present invention, rather than electronic switches, allows considerably wide signal tolerances. Reed switches can often take temporary overloads whereas electronic switches normally fail immediately with an overload.
  • Another advantage of the circuit and configuration of the present invention is that the L.E.D.'s are connected in a manner that not only determines the status of the valve but also indicate that the relevant switch is closed and actually does conduct the small signal levels that are also used to activate the L.E.D. 's.
  • a technician can readily determine, without having to open a sealed enclosure and perform current checks, whether the switch is functioning correctly ⁇ a job that is difficult and time- consuming.
  • Small analog and control signals are typically about 4 milliamperes and normally not larger than about 200 milliamperes, although reed switches may have a significantly greater current carrying ability.
  • Another presently preferred circuit embodiment for electronic switch 14 is shown in FIG. 8.
  • Voltage L(+) which is typically a system voltage, may be either direct current or alternating current and will typically range from 24 to 120 volts A.C. or D.C.
  • the circuit of FIG. 8 will work for wide tolerances in voltage L(+).
  • Typical values for operating voltage L(+) of the present embodiment may be 24 volts up to 120 volts AC or DC, with a wide tolerance for these voltages. The wide range of possible supply voltages do not adversely affect operation of either the switches or the L.E.D.'s.
  • N(-) which may be a circuit ground, common, system ground value, chassis ground, or could be a negative voltage, and so forth. Ground may also be applied by ground line 60.
  • the dashed lines shown in FIG. 8 generally represent field wiring external to switch housing 14.
  • Bridge rectifiers 62 and 64 provide that either alternating current or direct current will activate respective L.E.D.'s 66 and 68.
  • Zener diodes D3 and D4 are parallel with respective L.E.D.'s to ensure a constant voltage even with quite wide variations in power.
  • Varistors VI and V2 protect switches 30 and 32, as well as respective bridge rectifiers 62 and 64, from damaging back emf s that occur as the switches open to thereby interrupt supply to an inductive load such as a relay coil and the like.
  • Resistors 70 and 72 limit current to respective L.E.D.'s to prevent damage and promote long life.
  • Switches 30 and 32 function to indicate that rotary element 19 is, respectively, open or closed.
  • Output lines provide the status information, as determined by the position of switches 30 and 32, to the open and closed loads 74 and 76, respectively, applied by the control system.
  • a respective normally open reed switch will close at the end of valve actuator 13 travel to allow current to flow.
  • This output is used by the customer to energize a load i.e. relay coil, solenoid, P.L.C. input, and the like.
  • the L.E.D. can only be illuminated if (1) the respective reed switch is closed, and (2) the respective reed switch is also conducting electricity. Thus, illumination of the L.E.D. provides proof to service personnel that the switch is operational.
  • red L.E.D. 66 is typically used to visually indicate an open valve and green L.E.D. 68 indicates a closed valve.
  • the circuit of the present invention will operate on 6 to 120 volts A.C. or
  • valve actuator 13 If valve actuator 13 is run fully open or closed, then a respective of magnets 26 and 28 in magnet holder 16 will be rotated into the appropriate reed switch magnetic activation field. The selected switch will close its contact and drive the customer's load device, and the respective rectifier will therefore have current flowing through it and will produce a D.C. voltage supply on its +/- terminals. The respective Zener diode will shunt off voltage and hold a steady value across the L.E.D. branch circuit. A respective of resistors 70 and 72 is placed in series with each L.E.D. to limit the current flow through the L.E.D. within its design parameters.
  • Varistors VI and V2 are located in the circuit across the respective bridge rectifiers and reed switch contacts.
  • the varistors have no effect on the circuit (very high impedance) provided that the voltage potential does not exceed the respective varistor rating.
  • the varistor's ability to clip-off dangerous power spikes also minimizes the magnitude of any arcing that occurs when switch contacts break an energized circuit, thus prolonging contact life. In this manner, the varistors provide over-voltage and back emf protection to the switches.
  • the present circuitry is usable with a wide range of supply voltages and types of loads, includes a self-test L.E.D. that eliminates questions of switch operation to reduce service time, and is sealed in a rugged, water proof, explosion-proof package.
  • L.E.D. self-test L.E.D. that eliminates questions of switch operation to reduce service time
  • FIG. 6 yet another feature of the present invention is shown that allows for multiple circuits operating at different voltages.
  • an emergency shutdown circuit may be connected to switch indicator 10A, and the computer control system could be connected to switch indicator 10.
  • Each system could operate at separate voltages. However, closed and open signals at those separate voltages would be available by the stacked switch boxes 15 and 15A operated by respective stacked magnet holders 16 and 16A.
  • Other respective features discussed earlier are referred to with an "A" suffix.
  • the size and shape of the housings of the present invention are very suitable for such stacking, which may be used to provide two or more circuits attached to a single actuator housing 12.
  • the foregoing disclosure and description of the invention is illustrative and explanatory thereof, and it will be appreciated by those skilled in the art that various changes in the size, shape, positioning, and materials, as well as in the details of the illustrated construction or combinations of features of the various elements, may be made without departing from the spirit of the invention.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Indication Of The Valve Opening Or Closing Status (AREA)

Abstract

On décrit un appareil indicateur amélioré (10) pour une vanne rotative et un procédé pour sa mise en ÷uvre, l'appareil comprenant un logement (15) à interrupteurs électroniques rempli d'époxyde ou d'un autre matériau essentiellement élastomère (29) pour fermer et isoler hermétiquement de l'extérieur le logement (15) à interrupteurs. On utilise deux interrupteurs (30, 32) à tiges disposés d'une manière étanche dans le logement (15) à interrupteurs électroniques pour indiquer la position ouverte et la position fermée de la vanne (17). On prévoit deux aimants (26, 28) correspondants qui sont montés dans un logement à aimants séparé (16) qui est monté sur un élément rotatif (20) du dispositif d'actionnement (13) de la vanne. Des diodes à luminescence (42, 44) émettent depuis une portion latérale (57) du logement (15) à interrupteurs électroniques et elles sont reliées de manière à indiquer non seulement que l'interrupteur respectif (30, 32) est fermé, mais également qu'il conduit l'électricité. On empile des logements (15A) à interrupteurs électroniques additionnels et des logements (16A) à aimants additionnels les uns sur les autres pour réaliser des circuits multiples qui peuvent fonctionner avec différentes tensions ou types de courant. Le circuit (14) à interrupteurs électroniques fonctionne avec une variété de courants ou de signaux, en particulier avec du courant alternatif et du courant continu.
PCT/US1995/004107 1994-07-05 1995-04-03 Indicateur de position de vanne rotative et procede de mise en ×uvre WO1996001384A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP95915011A EP0766801A1 (fr) 1994-07-05 1995-04-03 Indicateur de position de vanne rotative et procede de mise en uvre
AU22055/95A AU2205595A (en) 1994-07-05 1995-04-03 Rotary valve position indicator and method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/270,509 US5579800A (en) 1994-07-05 1994-07-05 Rotary valve position indicator and method
US08/270,509 1994-07-05

Publications (1)

Publication Number Publication Date
WO1996001384A1 true WO1996001384A1 (fr) 1996-01-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1995/004107 WO1996001384A1 (fr) 1994-07-05 1995-04-03 Indicateur de position de vanne rotative et procede de mise en ×uvre

Country Status (4)

Country Link
US (2) US5579800A (fr)
EP (1) EP0766801A1 (fr)
AU (1) AU2205595A (fr)
WO (1) WO1996001384A1 (fr)

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EP0798472A1 (fr) * 1996-03-28 1997-10-01 Festo KG Actionneur rotarif entraîné par fluide
EP3029645A1 (fr) * 2014-12-04 2016-06-08 FESTO AG & Co. KG Dispositif d'affichage et actionneur doté d'un dispositif d'affichage
US9677549B2 (en) 2005-07-28 2017-06-13 Graco Minnesota Inc. Reciprocating pump with electronically monitored air valve and piston

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US6244296B1 (en) 1999-02-23 2001-06-12 Spx Corporation Position detection for rotary control valves
US6431519B1 (en) 1999-07-07 2002-08-13 Big Horn Valve, Inc. Axially rotated valve actuation system
JP3689614B2 (ja) * 2000-03-21 2005-08-31 株式会社日立製作所 位置測定装置の磁石固定方法
DE20115060U1 (de) * 2001-09-12 2002-01-31 Trw Deutschland Gmbh Nockenwellenloser Aktuator für Betätigung eines Hubventils
ITBZ20010043A1 (it) 2001-09-13 2003-03-13 High Technology Invest Bv Generatore elettrico azionato da energia eolica.
US7677261B1 (en) 2001-10-29 2010-03-16 Big Horn Valve, Inc. High flow, low mobile weight quick disconnect system
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US5579800A (en) 1996-12-03
AU2205595A (en) 1996-01-25
US5518028A (en) 1996-05-21
EP0766801A1 (fr) 1997-04-09

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